There is alternative to invest not in investment that you wanted but you need to buy a hardware if you know antminer its more profitable to make a good profit and less risk. .
Never trust any website that are giving high interest in short period of time.. They are almost scam
Check this thread https://bitcointalk.org/index.php?topic=1339672
As you can see almost all listed there are scam site maybe what you are looking for is listed there .. I don't like to risk my money that i know in the end i will lose..
So be careful in any investment site they are almost scam..